Investigators said on Monday the militants who attacked Mumbai had months of commando training in Pakistan, adding to rising tensions between the neighbours as recriminations mounted at home.

The fallout prompted a second top politician from the ruling Congress party to resign, amid growing anger at intelligence failures that many Indians believe allowed 10 Islamist gunmen to kill 183 people and besiege India's financial capital for three bloody days.

The attacks, which struck Mumbai's two best-known luxury hotels and other landmarks in the city of 18 million, are a major setback for improving ties between India and Pakistan.

The White House said US Secretary of State Condoleezza Rice would visit India on Wednesday, underscoring the seriousness with which Washington viewed the attacks and the potential threat they had to regional stability.

"I don't want to jump to any conclusions myself on this, but I do think that this is a time for complete, absolute, total transparency and cooperation and that is what we expect (from Pakistan)," Rice told reporters travelling with her to London.

Two senior investigators said on condition of anonymity that evidence from the interrogation of Azam Amir Kasav, the only gunmen of the 10 captured alive, clearly showed that Pakistani militants had a hand in the attack.

The clean-shaven, 21-year-old with fluent English was photographed during the attack wearing a black t-shirt emblazoned with the Versace logo. He has said his team took orders from "their command in Pakistan", police officials said.

PAKISTAN TRAINING

The training was organised by the Lashkar-e-Taiba militant group, and conducted by a former member of the Pakistani army, a police officer close to the interrogation said, on condition of anonymity because he was not authorised to speak.

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